Snap Lock Punch Punch Type Sheet Metal Punch Application Sheet Metal Fabrication Creates Hole Size 3/8 in Overall Length 8 in Maximum Jaw Opening 3/8 in Maximum Material Thickness Aluminum 0.035 in Copper 0.023 in Galvanized Steel 0.028 in Mild Steel 0.024 in Stainless Steel 0.018 in Features Easy One-Hand-Operation Including an Easy Open and Close Latch Motion Redline Handle With Compound Handle Leverage Finish Black Oxide Frame Material Steel Handle Color Red/Black